Enrollment and Registration > Registers of Canal Boats under 35 George III cap. 58 'An Act for requiring all boats, barges and other vessels of certain descriptions, used on navigable rivers and on inland navigations, in Great Britain, to be registered.' This Act was only concerned with vessels over 13 tons. > Register of Canal Boats under 35 George III cap. 58 'An Act for requiring all boats, barges and other vessels of certain descriptions, used on navigable rivers and on inland navigations, in Great Britain, to be registered.' This Act was only concerned with vessels over 13 tons.